› used to add the meaning "not," "lacking," or "the opposite of" to adjectives, adverbs, verbs, and nouns: unaided; unalterable; unaltered; unanticipated; unappreciated; unapproachable; unassigned; unassisted; unattainable; unbiased; uncommunicative; unconfined; unconvinced; uncultured; undefined; undiminished; uneconomical; unlicensed; unmodified; unmonitored; unmotivated; unobtainable; unpublished; unregulated; unrestricted; unrestrictive; unscheduled; unstressed; unstructured; unsustainable